def test_convergence_of_archipelago_unconverged(one_island):
archipelago = SerialArchipelago(one_island, num_islands=6)
assert archipelago.get_best_fitness() > 0
def test_convergence_of_archipelago(one_island, island_list):
archipelago = SerialArchipelago(one_island, num_islands=4)
archipelago._islands = island_list
assert archipelago.get_best_fitness() <= 0